package edu.study.common.util.mock;

import org.springframework.aop.framework.AdvisedSupport;
import org.springframework.aop.framework.AopProxy;
import org.springframework.aop.support.AopUtils;

import java.lang.reflect.Field;
  
public class AopTargetUtils {  
    /** 
     * 获取 目标对象 
     *  
     * @param proxy 
     *            代理对象 
     * @return 
     * @throws Exception 
     */  
    public static Object getTarget(Object proxy) throws Exception {  
        if (!AopUtils.isAopProxy(proxy)) {  
            return proxy;// 不是代理对象  
        }  
        if (AopUtils.isJdkDynamicProxy(proxy)) {  
            return getJdkDynamicProxyTargetObject(proxy);  
        } else { // cglib  
            return getCglibProxyTargetObject(proxy);  
        }  
    }  
  
    private static Object getCglibProxyTargetObject(Object proxy)  
            throws Exception {  
        Field h = proxy.getClass().getDeclaredField("CGLIB$CALLBACK_0");  
        h.setAccessible(true);  
        Object dynamicAdvisedInterceptor = h.get(proxy);  
        Field advised = dynamicAdvisedInterceptor.getClass().getDeclaredField(  
                "advised");  
        advised.setAccessible(true);  
        Object target = ((AdvisedSupport) advised  
                .get(dynamicAdvisedInterceptor)).getTargetSource().getTarget();  
        return target;  
    }  
  
    private static Object getJdkDynamicProxyTargetObject(Object proxy)  
            throws Exception {  
        Field h = proxy.getClass().getSuperclass().getDeclaredField("h");  
        h.setAccessible(true);  
        AopProxy aopProxy = (AopProxy) h.get(proxy);  
        Field advised = aopProxy.getClass().getDeclaredField("advised");  
        advised.setAccessible(true);  
        Object target = ((AdvisedSupport) advised.get(aopProxy))  
                .getTargetSource().getTarget();  
        return target;  
    }  
}  
